package com.itcam.interceptors;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.itcam.common.Result;
import com.itcam.common.ResultCodeEnum;
import com.itcam.utils.JwtHelper;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * Author:Cammy.Wu
 * Date:2024-05-13
 * Description:登录包含拦截器，检查请求头是否包含有效token
 * 有 ———— 有效 ———— 放行
 * 没有 ———— 无效 ———— 返回504
 */

public class LoginProtectedInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtHelper jwtHelper;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 从请求头中获取token
        String token = request.getHeader("token");

        // 检查是否有效
        boolean expiration = jwtHelper.isExpiration(token);

        // 有效放行
        if (!expiration) {
            // 放行，没有过期
            return true;
        }

        // 无效返回504的状态json
        Result result = Result.build(null, ResultCodeEnum.NOTLOGIN);

        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(request);
        response.getWriter().println(json);

        return false;
    }
}
